It must return the number of unmapped bytes on success, returning 0 means
that unmapping failed and in result only one page is unmapped.

Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 drivers/iommu/tegra-gart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 4c0abdcd1ad2..89ec24c6952c 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -313,7 +313,7 @@ static size_t gart_iommu_unmap(struct iommu_domain *domain, 
unsigned long iova,
        gart_set_pte(gart, iova, 0);
        FLUSH_GART_REGS(gart);
        spin_unlock_irqrestore(&gart->pte_lock, flags);
-       return 0;
+       return bytes;
 }
 
 static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
-- 
2.16.3

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